CN105926690B - Method for detecting pile foundation post-grouting quality by applying boron neutron life logging technology - Google Patents
Method for detecting pile foundation post-grouting quality by applying boron neutron life logging technology Download PDFInfo
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- CN105926690B CN105926690B CN201610349144.7A CN201610349144A CN105926690B CN 105926690 B CN105926690 B CN 105926690B CN 201610349144 A CN201610349144 A CN 201610349144A CN 105926690 B CN105926690 B CN 105926690B
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- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 229910052796 boron Inorganic materials 0.000 title claims abstract description 26
- 238000005516 engineering process Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000002689 soil Substances 0.000 claims abstract description 52
- 239000002002 slurry Substances 0.000 claims abstract description 35
- 238000001514 detection method Methods 0.000 claims abstract description 32
- 239000004568 cement Substances 0.000 claims abstract description 19
- 238000009826 distribution Methods 0.000 claims abstract description 15
- 230000005251 gamma ray Effects 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000004327 boric acid Substances 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 9
- 230000008859 change Effects 0.000 claims abstract description 6
- 238000007569 slipcasting Methods 0.000 claims description 38
- 239000011440 grout Substances 0.000 claims description 15
- 238000009792 diffusion process Methods 0.000 claims description 14
- 230000002093 peripheral effect Effects 0.000 claims description 14
- 239000013049 sediment Substances 0.000 claims description 13
- 238000007596 consolidation process Methods 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 239000000700 radioactive tracer Substances 0.000 claims description 5
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 4
- 229920002472 Starch Polymers 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000010835 comparative analysis Methods 0.000 claims description 3
- 230000004069 differentiation Effects 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 235000019698 starch Nutrition 0.000 claims description 3
- 239000008107 starch Substances 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 238000011049 filling Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 2
- 230000002238 attenuated effect Effects 0.000 abstract 1
- QDPOHAYYMHVFMI-UHFFFAOYSA-N boron;hydrate Chemical compound [B].O QDPOHAYYMHVFMI-UHFFFAOYSA-N 0.000 abstract 1
- 230000006872 improvement Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000012372 quality testing Methods 0.000 description 3
- 238000000280 densification Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a new method for detecting pile foundation post-grouting quality by applying a boron neutron life logging technology, which comprises the following steps: (1) adding boric acid for capturing thermal neutrons into the cement slurry; (2) putting an underground neutron generator and a gamma-ray detector into the bottom of a detection tube reserved in the pile foundation, wherein the underground neutron generator starts to repeatedly emit high-energy pulse neutrons, and the high-energy pulse neutrons are gradually lifted upwards; the gamma-ray detector synchronously records the relative change of the number of thermal neutrons in the medium, the number of the thermal neutrons in the measurement stage is attenuated in an exponential form, and a base line is measured; (4) grouting; (5) detecting after grouting in the same way as the step (3) to obtain a boron-water curve; the invention compares the base line measured before grouting with the boron water curve measured after grouting, can visually identify the upward return height and the distribution position of the post-grouting liquid, and further judges the distribution condition of the post-grouting liquid in the soil layer at the pile end and the soil body around the pile.
Description
Technical field
The present invention relates to a kind of new methods using boron neutron technology detection of pier foundation post jacking quality, belong to bridge
Beam pile measurement field.
Background technology
Pile foundation post-grouting technology refers in bored pile piling and after reaching some strength, by being embedded in stake week or stake in advance
Madjack pipe in body will play the role of the slurries jacked pile end soil layer and pile peripheral earth of cementation solidifying using high-pressure injection pump
In, to which pile bottom sediment, bearing course at pile end and mud cake around pile utilize the works such as infiltration, filling, densification, splitting and the consolidation of slurries
With the physical property and mechanical state of change original soil body make the intensity of pile-end soil and Pile side soil be improved, to varying degrees
End resistance and frictional force in side-pile are improved, and then reduces the settling amount of stake, improves the bearing capacity of stake.Pile foundation post-grouting technology passes through
The slurries that can play the role of cementation solidifying to the injection of the soil body of stake end and stake side are reinforced, the soil body at solidification stake end and stake side, can
It is long to effectively reduce stake, improves pouring pile bearing capacity, reduces pile body settling amount, shortens the construction period, reduces the project cost etc. of bored concrete pile
Advantage, pile foundation post-grouting technology is with the obvious advantage, and application prospect is good, has been obtained extensively in fields such as traffic, building, water conservancies in recent years
Using.
However since pile foundation belongs to concealed work, pile foundation post grouting construction quality is difficult to judge, geological conditions is changeable
Complexity, preset slurry formula, grouting pressure, mud jacking amount are after the implementation of mud jacking process during slip casting, specific mud jacking
The evaluation of effect is difficult, to being presently mainly whether to meet design evaluating stake by measuring ultimate bearing capacity of single pile to want
It asks, this method can only randomly select a part and carry out representative detection, can not be suitable for a large amount of pile foundation post jacking quality testings
Engineer application, and directly grouting result can not be evaluated, it can only indirectly reflect grouting result.In existing detection means
In, for the consolidation effect of slurries in pile body bottom and pile peripheral earth, there has been no preferable quality detection methods at present.
This patent is directed to this problem, proposes the method using boron neutron technology, can be to pile foundation post jacking skill
Distribution situation of the grouting result, slurries of art in the soil body is detected, to provide inspection for the effect of evaluation pile foundation post jacking
Measured data.
Invention content
In order to overcome drawbacks described above existing for existing pile foundation post grouting construction quality determining method, the present invention provides one kind can
The distribution situation of the grouting result, slurries of pile foundation post-grouting technology in the soil body is detected, to be pressed after evaluation pile foundation
The effect of slurry provides the new method using boron neutron technology detection of pier foundation post jacking quality of detection data.
The technical solution adopted by the present invention is：
Using the new method of boron neutron technology detection of pier foundation post jacking quality, it is characterised in that：Including as follows
Step：
(1), cement grout configures, determines grouting pressure, injection speed and grouting amount：The cement grout configured need to expire
Sufficient Grouting Design intensity requirement；And boric acid is added in the cement grout configured, it is uniformly mixed, boric acid is used as tracer
To capture thermal neutron；
(2), it is detected before slip casting：Neutron Generator for Logging and gamma ray detector are put into the detection pipe being reserved in pile foundation
Interior, the accelerator for neutron production and gamma ray detector is connect with surface instrument respectively；Wait for the Neutron Generator for Logging and
After gamma ray detector reaches the bottom of detection pipe, the Neutron Generator for Logging starts repeat its transmission high energy pulse neutron,
High energy pulse neutron is gradually lifted up；The opposite variation of subnumber is hankered in the gamma ray detector synchronous recording medium,
Measuring phases are hankered subnumber and are decayed with exponential form, and a baseline is measured；
(4), slip casting：Cement grout is passed through the Grouting Pipe pressure that is embedded in pile body and stake week by grouting pump under pressure
Enter in pile-end soil layer and pile peripheral earth；Meanwhile the boric acid as underground thermal neutron strong capture agent also follows cement grout to be injected into
In pile-end soil layer and pile peripheral earth；
(5), it is detected after slip casting：Slip casting terminates to examine after carrying out slip casting to pile-end soil layer and pile peripheral earth after maintenance is reinforced
It surveys, the detection mode detected after slip casting is identical as the detection mode of above-mentioned steps (3), measures a boron water curve；
The baseline measured before slip casting and the boron water curve measured after slip casting are compared, it is forward and backward measure twice hanker
Sub- macroscopic capture cross-section curve generates deviation, can intuitively be identified according to the size of this deviation and return height on post jacking liquid and divide
Cloth position, and then differentiation post jacking liquid is in the distribution situation of pile-end soil layer and pile peripheral earth.
In the step (5) after slip casting, the first interface and are formed between soil mass consolidation and the unguyed soil body
Second interface；Wherein, interface of first interface between bored concrete pile and undisturbed soil can obtain slurries according to the height at the first interface
Height h is returned along pile body；Interface of the second contact surface between undisturbed soil and undisturbed soil slurry mixture, according to second contact surface
Position can obtain diffusion breadth d of the slurries in stake bottom diffusion depth H and slurries in stake week undisturbed soil；According to before slip casting,
The comparative analysis of the macroscopic capture cross-section curve detected afterwards obtains returning height h, diffusion deeply by difference situation of change
H and diffusion breadth d is spent, so as to analyze distribution of the slurries in sediment, stake side and pile-end soil body to evaluate note
Starch the reinforcing improvement to pile bottom sediment.
In the present invention, the technology key of boron neutron is：" survey-ooze-surveying " technology.Occurred by underground neutron
Device emits pulse high energy fast neutron to stratum, becomes thermal neutron after repeatedly colliding with stratum, and thermal neutron is very slow due to speed
And gamma-rays is discharged easily by the atom nuclear capture in stratum, when thermal neutron is captured, by the counting rate for detecting gamma ray
And then the macroscopic capture cross-section of bottom is found out, and then the related parameter that has on stratum is can measure, distinguish stratum water layer.The present invention is by boric acid
As tracer, the comparison of " baseline " and " boron water curve " after slip casting before " survey-ooze-surveying " obtained slip casting can be with
Intuitive disclose returns height and the distribution of pile bottom sediment consolidation zone on pile body surrounding soil slurries.It is not by casing and cement sheath
It influences, is suitable for pile foundation post jacking quality testing.
For pile foundation post jacking reinforcing scope, the detection content master of grouting result is carried out using boron neutron technology
Including：Height detection, the detection of pile bottom sediment area distribution are returned on pile body surrounding soil slurries：
1, during pile foundation post jacking, the soil body of mudcake soil and mudcake soil periphery in the above certain altitude in stake end is one
Determine to be reinforced in width range, the soil body participates in the carrying of stake after slurry consolidation, improves stake-Soil Interface condition, improves stake
Collateral resistance can detect slurries using boron neutron technology and return height on stake week, rub to stake side to evaluate slip casting
The improvement of resistance.
2, during pile foundation post jacking, the slurries and the sediment at stake bottom of pile foundation mud jacking injection are mixing cured, condense into one
The Seed harvest of a intensity height, stable chemical performance, slurries can be detected in pile bottom sediment using boron neutron technology
Distribution situation, to evaluate reinforcing improvement of the slip casting to pile bottom sediment.
The invention has the advantages that：
1, the actual conditions suitable for the detection of pile foundation post jacking, are pressed after pile foundation can be completed only by reserved sound detecting pipe
The detection of slurry, detection efficiency greatly improve.
2, boron neutron technology detection of pier foundation post jacking survey-ooze-is surveyed not by lithology, temperature, casing, cement sheath
Etc. factors influence, it is opposite to be detected with ordinary ultrasonic, be suitable for the detection of all kinds of pile foundation environment, while detection error also significantly subtracts
It is small, there is better spatial resolution and sensitivity.
Description of the drawings
Fig. 1 is that boron neutron technology implements schematic diagram.
Specific implementation mode
Referring to Fig.1, it using the new method of boron neutron technology detection of pier foundation post jacking quality, including walks as follows
Suddenly：
(1), cement grout configures, determines grouting pressure, injection speed and grouting amount：The cement grout configured need to expire
Sufficient Grouting Design intensity requirement；And boric acid is added in the cement grout configured, it is uniformly mixed, boric acid is used as tracer
To capture thermal neutron；
(2), it is detected before slip casting：Neutron Generator for Logging and gamma ray detector are put into the detection pipe being reserved in pile foundation
Interior, the accelerator for neutron production and gamma ray detector is connect with surface instrument respectively；Wait for the Neutron Generator for Logging and
After gamma ray detector reaches the bottom of detection pipe, the Neutron Generator for Logging starts repeat its transmission high energy pulse neutron,
High energy pulse neutron is gradually lifted up；The opposite variation of subnumber is hankered in the gamma ray detector synchronous recording medium,
Measuring phases are hankered subnumber and are decayed with exponential form, and a baseline is measured；This decay has reacted the capture of thermal neutron.Stratum pair
The entrapment properties of thermal neutron, what the various elements by forming stratum determined the entrapment properties of thermal neutron, therefore can area accordingly
Divide each matter layer；
(4), slip casting：Cement grout is passed through the Grouting Pipe pressure that is embedded in pile body and stake week by grouting pump under pressure
Enter in pile-end soil layer and pile peripheral earth；Meanwhile the boric acid as underground thermal neutron strong capture agent also follows cement grout to be injected into
In pile-end soil layer and pile peripheral earth；
(5), it is detected after slip casting：Slip casting terminates to examine after carrying out slip casting to pile-end soil layer and pile peripheral earth after maintenance is reinforced
It surveys, the detection mode detected after slip casting is identical as the detection mode of above-mentioned steps (3), measures a boron water curve；
The baseline measured before slip casting and the boron water curve measured after slip casting are compared, since boron element is in underground heat disaster
Sub- strong capture agent and soluble easily in water, thus after having compressed water slurry liquid stratum, the forward and backward thermal neutron macroscopic view prisoner measured twice
It obtains cross section curve and generates deviation, can intuitively be identified according to the size of this deviation and return height and distributing position on post jacking liquid,
And then differentiation post jacking liquid is in the distribution situation of pile-end soil layer and pile peripheral earth.
In the step (5) after slip casting, the first interface and are formed between soil mass consolidation and the unguyed soil body
Second interface；Wherein, interface of first interface between bored concrete pile and undisturbed soil can obtain slurries according to the height at the first interface
Height h is returned along pile body；Interface of the second contact surface between undisturbed soil and undisturbed soil slurry mixture, according to second contact surface
Position can obtain diffusion breadth d of the slurries in stake bottom diffusion depth H and slurries in stake week undisturbed soil；According to before slip casting,
The comparative analysis of the macroscopic capture cross-section curve detected afterwards obtains returning height h, diffusion deeply by difference situation of change
H and diffusion breadth d is spent, so as to analyze distribution of the slurries in sediment, stake side and pile-end soil body to evaluate note
Starch the reinforcing improvement to pile bottom sediment.
In the present invention, the technology key of boron neutron is：" survey-ooze-surveying " technology.Occurred by underground neutron
Device emits pulse high energy fast neutron to stratum, becomes thermal neutron after repeatedly colliding with stratum, and thermal neutron is very slow due to speed
And gamma-rays is discharged easily by the atom nuclear capture in stratum, when thermal neutron is captured, by the counting rate for detecting gamma ray
And then the macroscopic capture cross-section of bottom is found out, and then the related parameter that has on stratum is can measure, distinguish stratum water layer.The present invention is by boric acid
As tracer, the comparison of " baseline " and " boron water curve " after slip casting before " survey-ooze-surveying " obtained slip casting can be with
Intuitive disclose returns height and the distribution of pile bottom sediment consolidation zone on pile body surrounding soil slurries.It is not by casing and cement sheath
It influences, is suitable for pile foundation post jacking quality testing.
In Fig. 1, h1 and h2 respectively represent adjacent bored concrete pile sizing liquor and return height along pile body；D1, d2, d3 and d4 distinguish
It represents slurries diffusion breadth, H1 in stake week undisturbed soil and represents slurries in stake bottom diffusion depth.
Finally it should be noted that listed above is only specific embodiments of the present invention.It is clear that the invention is not restricted to
Above example can also have many variations.Those skilled in the art can directly lead from present disclosure
All deformations for going out or associating, are considered as protection scope of the present invention.
Claims (1)
1. the method for application boron neutron technology detection of pier foundation post jacking quality, it is characterised in that：Include the following steps：
(1), cement grout configures, determines grouting pressure, injection speed and grouting amount：The cement grout configured need to meet filling
Starch design strength requirement；And boric acid is added in the cement grout configured, it is uniformly mixed, boric acid is as tracer, to capture
Obtain thermal neutron；
(2), it is detected before slip casting：Neutron Generator for Logging and gamma ray detector are put into the detection pipe being reserved in pile foundation,
The accelerator for neutron production and gamma ray detector is connect with surface instrument respectively；Wait for that the Neutron Generator for Logging and γ are penetrated
After line detector reaches the bottom of detection pipe, the Neutron Generator for Logging starts repeat its transmission high energy pulse neutron, high energy
Pulsed neutron is gradually lifted up；The opposite variation that subnumber is hankered in the gamma ray detector synchronous recording medium, measures
Stage is hankered subnumber and is decayed with exponential form, and a baseline is measured；
(3), slip casting：Cement grout is passed through the Grouting Pipe jacked pile that is embedded in pile body and stake week by grouting pump under pressure
It holds in soil layer and pile peripheral earth；Meanwhile the boric acid as underground thermal neutron strong capture agent also follows cement grout to be injected into an end
In soil layer and pile peripheral earth；
(4), it is detected after slip casting：
Slip casting terminates to detect after carrying out slip casting to pile-end soil layer and pile peripheral earth after maintenance is reinforced, the detection side detected after slip casting
Formula is identical as the detection mode of above-mentioned steps (3), measures a boron water curve；
The baseline measured before slip casting and the boron water curve measured after slip casting are compared, the forward and backward thermal neutron measured twice is macro
It sees capture cross-section curve and generates deviation, can intuitively be identified according to the size of this deviation and return height and distribution position on post jacking liquid
It sets, and then differentiation post jacking liquid is in the distribution situation of pile-end soil layer and pile peripheral earth.
After slip casting, the first interface and second contact surface are formed between soil mass consolidation and the unguyed soil body；Wherein, the first interface
Interface between bored concrete pile and undisturbed soil can obtain slurries according to the height at the first interface and return height h along pile body；The
Interface of the second interface between undisturbed soil and undisturbed soil slurry mixture can obtain slurries in stake according to the position of second contact surface
The diffusion breadth d of bottom diffusion depth H and slurries in stake week undisturbed soil；Obtained macroscopic view capture is detected according to slip casting is forward and backward
The comparative analysis of cross section curve obtains returning height h, diffusion depth H and diffusion breadth d by difference situation of change, to
Distribution of the slurries in sediment, stake side and pile-end soil body can be analyzed to change the reinforcing of pile bottom sediment to evaluate slip casting
Kind effect.
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| CN111650584B (en) * | 2020-05-14 | 2023-09-15 | 中国科学院武汉岩土力学研究所 | Method and equipment for detecting grouting reinforcement effect behind shield tunnel wall |
| CN111828043B (en) * | 2020-06-29 | 2022-06-28 | 上海隧道工程有限公司 | Method for monitoring diffusion range of synchronous grouting slurry of shield tail of large-diameter shield |
| CN113846706B (en) * | 2021-09-29 | 2023-02-17 | 北京中岩大地科技股份有限公司 | Construction method for dynamically monitoring rotary spraying effect |
| CN113846631B (en) * | 2021-09-29 | 2023-02-17 | 北京中岩大地科技股份有限公司 | Construction method for dynamically monitoring stirring construction effect |
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| CN201232182Y (en) * | 2008-08-01 | 2009-05-06 | 中铁十七局集团第二工程有限公司 | Post-mud jacking apparatus for bottom and lateral of bored pile |
| CN103452100A (en) * | 2013-08-20 | 2013-12-18 | 河北建设勘察研究院有限公司 | Construction method of post-grouting squeezing and expanding combination cast-in-place bored pile |
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2016
- 2016-05-23 CN CN201610349144.7A patent/CN105926690B/en active Active
Patent Citations (3)
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| CA2173961A1 (en) * | 1993-10-12 | 1995-04-20 | Andrzej K. Drukier | Improved quantitation of gamma and x-ray emitting isotopes |
| CN201232182Y (en) * | 2008-08-01 | 2009-05-06 | 中铁十七局集团第二工程有限公司 | Post-mud jacking apparatus for bottom and lateral of bored pile |
| CN103452100A (en) * | 2013-08-20 | 2013-12-18 | 河北建设勘察研究院有限公司 | Construction method of post-grouting squeezing and expanding combination cast-in-place bored pile |
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| Title |
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